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WO1993002840A1 - Lame - Google Patents

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Info

Publication number
WO1993002840A1
WO1993002840A1 PCT/CA1992/000332 CA9200332W WO9302840A1 WO 1993002840 A1 WO1993002840 A1 WO 1993002840A1 CA 9200332 W CA9200332 W CA 9200332W WO 9302840 A1 WO9302840 A1 WO 9302840A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
openings
cutting
base
base portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA1992/000332
Other languages
English (en)
Inventor
Lea Howard Macdonald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEA LEWIS TOOL Corp
Original Assignee
LEA LEWIS TOOL Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LEA LEWIS TOOL Corp filed Critical LEA LEWIS TOOL Corp
Publication of WO1993002840A1 publication Critical patent/WO1993002840A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B5/00—Hand knives with one or more detachable blades
    • B26B5/005—Hand knives with one or more detachable blades specially adapted for cutting cardboard, or wall, floor or like covering materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B9/00—Blades for hand knives

Definitions

  • the present invention relates to cutting blades and in particular to cutting blades suitable for use in specialized tools, for instance in carpet trimming tools.
  • Blades of this shape have the advantage that they can be used with one acute angled tip projecting from the handle, while the opposite tip is within the handle, ready for use, when the first used tip becomes dull.
  • the invention provides a cutting blade having generally planar opposed faces and a trapezoidal contour defined by a cutting edge coincident with a major base portion, a minor base portion parallel with the major base portion, and two end portions, each disposed at an acute angle to TUTE SHEET acute and obtuse angles being the same for both end portions, said openings being disposed in a row generally parallel with said base portions, characterized in that at least one of the opposed faces is provided with score lines perpendicular to the bases and equidistantly spaced between each pair of adjacent ones of said openings, to provide zones of weakness whereby the blade may be broken to obtain two sections, each having at least one of said openings and having the shape of an irregular quadrangle having a major base section, an opposed minor base section, a first side at right angles to said base sections and a slanted side forming said acute and obtuse angles with the major and minor base sections, respectively.
  • Figure 1 is a plan view of a commercially available cutting blade on a 1 :1 scale, modified in accordance with the present invention
  • Figure 2 is a view corresponding to Figure 1 but being on a substantially enlarged scale for convenience
  • Figure 3 is section 3 - 3 of Figure 2
  • Figure 4 is a diagrammatic representation of a section of the blade of Figure 2 mounted in a blade support of a cutting tool
  • Figure 5 is a view similar to that of Figure 4, with the blade section removed
  • Figure 6 is section 6 - 6 of Figure 5
  • Figure 7 is section 7 - 7 of Figure 5
  • Figure 8 is a view similar to that of Figure 2 but showing a modified embodiment of the blade.
  • the blade J_Q_ of Figs. 1 and 2 is a typical cutting blade used in many trades where clean and sharp cut is required, for instance in carpet cutting tools. It has two opposed, generally planar faces JJ., 2.
  • the contour of the blade is that of a trapezoid, where the cutting edge 13. forms a major base, the opposed, trailing edge J4 being the minor base and two opposed sides 15, 16 form the sides of the trapezoid.
  • Both sides S S 2 are at an acute angle a of about 55° to the major base 13 and at an obtuse angle ⁇ of about 130° to the minor base 14.
  • Three openings 15, IS, and 12 are disposed in a row parallel with the bases of the trapezoid as is well known. The number of the openings is optional but it is to be emphasized that the actual number is limited by practical considerations. Three openings are considered an optimum, among others, for reasons that commercial blades of this type already have the three openings.
  • a system of score lines is provided in both faces 11 , 12 of the blade.
  • the score lines are in coincidence across the thickness of the blade and are therefore referred to with the same reference numeral.
  • the first score line J8 provides a linear line of weakness centrally between the openings 15, 16.
  • a similar score line J9 is disposed between the openings 16, 17 and an optional score line 20. extends through the centreline of the blade, intersecting the opening 16 at a centreline thereof.
  • the last mentioned example presents a substantial advantage when it is desired to have two different depths of cut, such as happens in carpet trimming, where the required depth may be short if only the underside of a carpet is to be cut, to a greater depth when the pile of the carpet is to be cut also.
  • Fig. 5 shows a part of a blade holder or base 21 of a cutting tool, for instance a carpet trimming tool.
  • the base is of a generally cylindric configuration the top surface 22 of which is designed to slide underneath a carpet.
  • the end face 23 of the base 21 is provided with a shallow rectangular recess 24 having a straight lower wall 25 and two straight, parallel side walls
  • a threaded bore 29. is complementary with a blade fixing screw 3P_.
  • the bore 29 is spaced rom the lower wall 25 the same distance as any of the holes 15 - 17 from the adjacent scorelines 18, 19.
  • the second part of the blade shown in broken lines, is used, with the clamping screw 30 engaging the opening 16.
  • the length of the cutting edge is equal to 13a + 13b, whereas the shorter version only has the length of 13a.
  • Figure 8 is merely intended to show that, while the preferred embodiment of the invention is derived from a standard cutting blade, other types of blades can be used in providing advantages of the invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Knives (AREA)

Abstract

On décrit une lame destinée à être utilisée dans des outils de coupe tels qu'un dispositif pour égaliser la moquette ou des couteaux à main. Cette lame présente un profil trapézoïdal dont la partie formant la base principale (13) constitue le tranchant de la lame. La lame est pourvue d'une rangée de trois ouvertures, de préférence, (15, 16, 17), destinées à un boulon de serrage. Une série d'entailles (18, 19, 20) perpendiculaires au tranchant, et placées au centre entre les ouvertures de serrage respectives (15, 17), permettent à la fois à la lame d'être utilisée comme une lame normale et d'être brisée en lames régulières ou irrégulières, ce qui permet à l'outil de coupe respectif d'ajuster sélectivement la profondeur de coupe.
PCT/CA1992/000332 1991-08-06 1992-08-05 Lame Ceased WO1993002840A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US740,887 1991-08-06
US07/740,887 US5103564A (en) 1991-08-06 1991-08-06 Sectioned cutting blade

Publications (1)

Publication Number Publication Date
WO1993002840A1 true WO1993002840A1 (fr) 1993-02-18

Family

ID=24978480

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1992/000332 Ceased WO1993002840A1 (fr) 1991-08-06 1992-08-05 Lame

Country Status (3)

Country Link
US (1) US5103564A (fr)
AU (1) AU2368392A (fr)
WO (1) WO1993002840A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5401208A (en) * 1994-01-14 1995-03-28 Marvin; Earle R. Oyster knife
USD422185S (en) * 1996-07-05 2000-04-04 Peter Gold Utility knife blade
USD479108S1 (en) 2002-12-05 2003-09-02 Pacific Handy Cutter, Inc. Safety blade
US20070101576A1 (en) * 2005-11-10 2007-05-10 Irwin Industrial Tool Company Blunt tip utility blade
USD608168S1 (en) 2006-04-20 2010-01-19 Irwin Industrial Tool Company Utility knife blade
US8161654B2 (en) * 2006-04-20 2012-04-24 Irwin Industrial Tool Company Four point utility blade and method
US7921568B2 (en) * 2006-04-20 2011-04-12 Irwin Industrial Tool Company Four point utility blade
US8926410B2 (en) 2009-03-02 2015-01-06 Irwin Industrial Tool Company Reciprocating saw blade with tangs on each end and related method
USD640907S1 (en) 2010-07-19 2011-07-05 Frank D Underhile Blade
USD640908S1 (en) 2010-07-19 2011-07-05 Frank D Underhile Blade
US8978257B2 (en) 2010-09-01 2015-03-17 Elwood Dean Quimby Utility knife with a blade having multiple cutting portions
US8950077B2 (en) 2010-09-01 2015-02-10 Elwood Dean Quimby Utility knife apparatus with blades having multiple cutting portions
US20120079722A1 (en) * 2010-09-01 2012-04-05 Elwood Dean Quimby Six cutting edge featured utility knife blade
US9009981B2 (en) 2010-09-01 2015-04-21 Elwood Dean Quimby Utility knife blades having multiple cutting portions and securing connections
US10239618B2 (en) * 2013-08-30 2019-03-26 B/E Aerospace, Inc. L shaped guide vanes for controlling and directing airflow in a galley chilled compartment
US9884380B2 (en) * 2014-06-20 2018-02-06 Black & Decker Inc. Saw blade with multiple tangs
KR101635800B1 (ko) * 2015-09-15 2016-07-04 주식회사 도루코 분절 가능한 양날형 면도날
US11097434B2 (en) 2017-12-21 2021-08-24 Mark Gordon Hooper Utility knife
US11433560B2 (en) * 2020-02-07 2022-09-06 Vincent Leon Giles Drywall knife
US20220330928A1 (en) * 2021-04-20 2022-10-20 David Alexander Phillips Multi-Orientation Razor Blade

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1049453A (en) * 1964-05-06 1966-11-30 Stanley Works Improvements in and relating to knives
US3448518A (en) * 1967-07-27 1969-06-10 Harry Sklar Knife
DE2256918A1 (de) * 1972-11-20 1974-06-20 Helward Boehm Messer zum schneiden von papier, pappe und dergleichen
US3845554A (en) * 1973-04-19 1974-11-05 N Joanis Knife blade and handle
US3893238A (en) * 1973-11-02 1975-07-08 Albert S Scholl Butt seam cutting tool

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA452882A (fr) * 1948-11-23 Sloman Irving Porte-lame et lame remplacable
US2123768A (en) * 1936-06-18 1938-07-12 Corsico-Piccolini Hector Safety razor blade
US2322744A (en) * 1941-07-12 1943-06-29 Sidney H Benjamin Safety razor blade
GB1523168A (en) * 1975-09-10 1978-08-31 Plas Plugs Ltd Hand grip for a hand knife
US4074431A (en) * 1976-04-21 1978-02-21 Rudolph Beaver, Inc. Surgical knife assembly, surgical blade, and method of manufacture thereof
US4729168A (en) * 1986-08-15 1988-03-08 Yeh Jia Yong Two-edged multi-purpose artistic technical knife

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1049453A (en) * 1964-05-06 1966-11-30 Stanley Works Improvements in and relating to knives
US3448518A (en) * 1967-07-27 1969-06-10 Harry Sklar Knife
DE2256918A1 (de) * 1972-11-20 1974-06-20 Helward Boehm Messer zum schneiden von papier, pappe und dergleichen
US3845554A (en) * 1973-04-19 1974-11-05 N Joanis Knife blade and handle
US3893238A (en) * 1973-11-02 1975-07-08 Albert S Scholl Butt seam cutting tool

Also Published As

Publication number Publication date
US5103564A (en) 1992-04-14
AU2368392A (en) 1993-03-02

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